ooh, that's a nice looking setup right there. I really like my Gobis as far as hard cases are concerned, but if I'm riding hard off road, I typically unlock the latches to the rack and just strap them on so that they can break free if I hit something, which has happened before. The only real downside is that because they are a dual-wall design, there isn't quite as much room inside as you might expect. I don't have any experience with the top case.
1986 Yamaha XT350
2005.5 KTM 950 Adventure
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950